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bd6972226f
There is some ambiguity in the RFC as to whether the ADD_ADDR HMAC is
the rightmost 64 bits of the entire hash or of the leftmost 160 bits
of the hash. The intention, as clarified with the author of the RFC,
is the entire hash.
This change returns the entire hash from
mptcp_crypto_hmac_sha (instead of only the first 160 bits), and moves
any truncation/selection operation on the hash to the caller.
Fixes: 12555a2d97 ("mptcp: use rightmost 64 bits in ADD_ADDR HMAC")
Reviewed-by: Christoph Paasch <cpaasch@apple.com>
Reviewed-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: Todd Malsbary <todd.malsbary@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
151 lines
4.1 KiB
C
151 lines
4.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Multipath TCP cryptographic functions
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* Copyright (c) 2017 - 2019, Intel Corporation.
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*
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* Note: This code is based on mptcp_ctrl.c, mptcp_ipv4.c, and
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* mptcp_ipv6 from multipath-tcp.org, authored by:
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*
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* Sébastien Barré <sebastien.barre@uclouvain.be>
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* Christoph Paasch <christoph.paasch@uclouvain.be>
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* Jaakko Korkeaniemi <jaakko.korkeaniemi@aalto.fi>
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* Gregory Detal <gregory.detal@uclouvain.be>
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* Fabien Duchêne <fabien.duchene@uclouvain.be>
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* Andreas Seelinger <Andreas.Seelinger@rwth-aachen.de>
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* Lavkesh Lahngir <lavkesh51@gmail.com>
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* Andreas Ripke <ripke@neclab.eu>
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* Vlad Dogaru <vlad.dogaru@intel.com>
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* Octavian Purdila <octavian.purdila@intel.com>
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* John Ronan <jronan@tssg.org>
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* Catalin Nicutar <catalin.nicutar@gmail.com>
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* Brandon Heller <brandonh@stanford.edu>
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*/
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#include <linux/kernel.h>
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#include <crypto/sha.h>
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#include <asm/unaligned.h>
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#include "protocol.h"
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#define SHA256_DIGEST_WORDS (SHA256_DIGEST_SIZE / 4)
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void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn)
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{
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__be32 mptcp_hashed_key[SHA256_DIGEST_WORDS];
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__be64 input = cpu_to_be64(key);
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struct sha256_state state;
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sha256_init(&state);
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sha256_update(&state, (__force u8 *)&input, sizeof(input));
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sha256_final(&state, (u8 *)mptcp_hashed_key);
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if (token)
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*token = be32_to_cpu(mptcp_hashed_key[0]);
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if (idsn)
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*idsn = be64_to_cpu(*((__be64 *)&mptcp_hashed_key[6]));
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}
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void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac)
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{
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u8 input[SHA256_BLOCK_SIZE + SHA256_DIGEST_SIZE];
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struct sha256_state state;
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u8 key1be[8];
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u8 key2be[8];
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int i;
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if (WARN_ON_ONCE(len > SHA256_DIGEST_SIZE))
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len = SHA256_DIGEST_SIZE;
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put_unaligned_be64(key1, key1be);
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put_unaligned_be64(key2, key2be);
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/* Generate key xored with ipad */
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memset(input, 0x36, SHA_MESSAGE_BYTES);
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for (i = 0; i < 8; i++)
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input[i] ^= key1be[i];
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for (i = 0; i < 8; i++)
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input[i + 8] ^= key2be[i];
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memcpy(&input[SHA256_BLOCK_SIZE], msg, len);
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sha256_init(&state);
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sha256_update(&state, input, SHA256_BLOCK_SIZE + len);
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/* emit sha256(K1 || msg) on the second input block, so we can
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* reuse 'input' for the last hashing
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*/
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sha256_final(&state, &input[SHA256_BLOCK_SIZE]);
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/* Prepare second part of hmac */
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memset(input, 0x5C, SHA_MESSAGE_BYTES);
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for (i = 0; i < 8; i++)
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input[i] ^= key1be[i];
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for (i = 0; i < 8; i++)
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input[i + 8] ^= key2be[i];
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sha256_init(&state);
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sha256_update(&state, input, SHA256_BLOCK_SIZE + SHA256_DIGEST_SIZE);
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sha256_final(&state, (u8 *)hmac);
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}
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#ifdef CONFIG_MPTCP_HMAC_TEST
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struct test_cast {
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char *key;
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char *msg;
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char *result;
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};
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/* we can't reuse RFC 4231 test vectors, as we have constraint on the
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* input and key size.
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*/
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static struct test_cast tests[] = {
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{
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.key = "0b0b0b0b0b0b0b0b",
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.msg = "48692054",
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.result = "8385e24fb4235ac37556b6b886db106284a1da671699f46db1f235ec622dcafa",
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},
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{
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.key = "aaaaaaaaaaaaaaaa",
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.msg = "dddddddd",
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.result = "2c5e219164ff1dca1c4a92318d847bb6b9d44492984e1eb71aff9022f71046e9",
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},
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{
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.key = "0102030405060708",
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.msg = "cdcdcdcd",
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.result = "e73b9ba9969969cefb04aa0d6df18ec2fcc075b6f23b4d8c4da736a5dbbc6e7d",
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},
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};
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static int __init test_mptcp_crypto(void)
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{
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char hmac[32], hmac_hex[65];
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u32 nonce1, nonce2;
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u64 key1, key2;
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u8 msg[8];
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int i, j;
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for (i = 0; i < ARRAY_SIZE(tests); ++i) {
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/* mptcp hmap will convert to be before computing the hmac */
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key1 = be64_to_cpu(*((__be64 *)&tests[i].key[0]));
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key2 = be64_to_cpu(*((__be64 *)&tests[i].key[8]));
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nonce1 = be32_to_cpu(*((__be32 *)&tests[i].msg[0]));
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nonce2 = be32_to_cpu(*((__be32 *)&tests[i].msg[4]));
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put_unaligned_be32(nonce1, &msg[0]);
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put_unaligned_be32(nonce2, &msg[4]);
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mptcp_crypto_hmac_sha(key1, key2, msg, 8, hmac);
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for (j = 0; j < 32; ++j)
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sprintf(&hmac_hex[j << 1], "%02x", hmac[j] & 0xff);
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hmac_hex[64] = 0;
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if (memcmp(hmac_hex, tests[i].result, 64))
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pr_err("test %d failed, got %s expected %s", i,
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hmac_hex, tests[i].result);
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else
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pr_info("test %d [ ok ]", i);
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}
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return 0;
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}
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late_initcall(test_mptcp_crypto);
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#endif
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